[Quant][Inductor] Enable dequant promotion inside inductor (#104590)
**Summary**
Enable the `dequant pattern` promotion pass in inductor. Since in the qconv weight prepack pass, we will match the `dequant->conv2d` pattern. If the `dequant pattern` has multi user nodes, it will fail to be matched.
Taking the example of
```
conv1
/ \
conv2 conv3
```
After quantization flow, it will generate pattern as
```
dequant1
|
conv1
|
quant2
|
dequant2
/ \
conv2 conv3
```
We need to duplicate `dequant2` into `dequant2` and `dequant3`, in order to make `dequant2->conv2` and `dequant3->conv3` pattern matched.
**Test Plan**
```
python -m pytest test_mkldnn_pattern_matcher.py -k test_dequant_promotion
```
Pull Request resolved: https://github.com/pytorch/pytorch/pull/104590
Approved by: https://github.com/jgong5, https://github.com/eellison
ghstack dependencies: #104580, #104581, #104588
